post https://example.com/v1/deleteField
This method deletes the specified field
Delete the specified field
POST /api/v1/deleteField HTTP/1.1
Host: www.formstack.com
api_key=[[app:api_key]]&id=12345
curl -X POST -i -d "api_key=[[app:api_key]]&id=12345" https://www.formstack.com/api/v1/deleteField